The fifth prince Zhao Yi was framed for rebellion and locked in the heavenly prison, trading his life for half a month of authority to investigate the case. Starting from false confessions, forged weaponry, and the jade pendant mystery, he turns the tables on the annulment bureau, slaps faces on the spot by claiming mansion debts, while old accounts of the cold palace, old acquaintances in the heavenly prison, and bets from various mansions unfold in rapid twists. His fiancée Xia Yanran makes calm judgments, Rong Yu climbs over walls to assist, and his imperial father Emperor Jing probes while granting power. While clearing his name, Zhao Yi reorganizes his prince's mansion and selects guards. After the charges are revoked, he still intends to uncover the final ledger. The down-and-out prince walks from the prison gates to the imperial court, with dense exciting highlights, intertwining court scheming and emotions, as the first force gathers from here.